Posts: 3504
Location: Elk River, Minnesota | How about a dry graphite spray? Here is something you can try that might be able to do the same thing and hopefully not gum up with grit, dust, etc.
If you have a construction pencil (those big flat fat ones) you can do lubricate it with that. Clean the entire surface as best you can to eliminate any grease, or residue. Then, take the pencil over the bar. The graphite in a pencil is the same as what is in a dry graphite spray. I use this method on my wife's 9mm to lubricate the slide mechanism.
Does the knob have any sort of plastic or friction end to it? I wouldn't think it would be just a normal end to a screw as that would damage the bar. How does the motor turn if you remove the screw altogether or back it off as far as you can take it? Does it still bind?
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